Analysis and verification of a pyroshock test system

Download

12626154.pdf

Date

2021-2-03

Author

Küçükbayram, Anıl İsmail

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

553
views

930
downloads

In the aerospace industry, systems, subsystems, and units are exposed toexplosive events during their lifecycle. Any explosive event creates shock in the structure, and it propagates until it is damped. This shock wave may be hazardous for some electronic and optical components. It may damage a component and cause failure in the equipment. For this reason, satellite equipmenthas tobe qualifiedto withstand all static and dynamic loads encountered during launch and operational life. Thus, one of the challenging tests in the qualification process is the pyroshock test, which is performed on aerospace structures to ensure equipment functionality and integrity against shock load. There are several methods to perform a pyroshock test. The commonly used method is by mechanical impact. A resonant plate is excited by a hammer, and shock waves propagate through the plate. This type of test system is suitable for testing space equipment that will be exposed to mid-field and far-field shock. Test system configuration parameters such as plate thickness, mass, geometry, etc., are adjusted to obtain an appropriate Shock Response Spectrum (SRS)profile. Some of these parameters are less effective, and some are highlyeffective in obtaining the desired shock profile. The test operator has to performlong trials with the dummy model to obtain the targettest profile. In order to minimize this preparation time, the effects of the configuration parameters must be well known. Therefore, this study was started by analyzing the effect of configuration parameters on the SRS profilein ABAQUS/Explicit finite element software. The requested SRS profile for testing is predicted by optimizing configuration parameters in the analysis. In this manner, it is aimed to complete the profile fittingprocess performed on the dummy model in a much shorter time. In this study, measurement,and characterization of pyroshock test system, requirements for various experimental simulations, resonant plate excitation and measurement techniques, data acquisition, and an overview of numerical simulation are reviewed. The developed components of the shock test system and the corresponding finite element model are experimentally validated. The shock tests are simulated using ABAQUS/Explicit finite element software. As a result of this research, an accuratefinite element modeling technique for future shock test simulation and prediction of test results was developed.

Subject Keywords

Pyroshock simulation, Shock response spectrum, Impact force profile, Shock testing, Space equipment

URI

https://hdl.handle.net/11511/89644

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Numerical Validation of a Pyroshock Test System and Application to Qualification Tests Yalçınkaya, Tuncay; Gursoy, Bahadir (2022-08-01) Spacecraft are exposed to severe mechanical loads, i.e., shock loads, during their journey to orbit. Such loads usually develop due to a separation event through the activation of pyrotechnic devices. They might be transmitted throughout the entire structure and strongly influence the service performance of electronic components. Therefore, it is crucial to study whether the instruments can resist such a harsh environment. However, due to the vulnerability and high cost of the equipment, experimental setups...
Comparison of Outer Rotor Radial Flux and Axial Flux PM Motors for CMG Application Ertan, Hulusi Bülent (2014-09-05) Control moment gyroscopes (CMG) are used in modern satellite applications for attitude control of satellites. The volume and mass of the instruments is very important in such applications. In this context, integrating the mass of the CMG, on the stator of the motor, promises to save space and mass. Radial-flux outer-rotor motor is a promising configuration in that respect. In this paper, using such a PM motor is considered for control moment gyroscope applications. The design of the motor must be made such ...
Experimental Modal Analysis of Geometrically Nonlinear Structures by Using Response-Controlled Stepped-Sine Testing Karaağaçlı, Taylan; Özgüven, Hasan Nevzat (2022-01-01) The everlasting competition in the industry to achieve higher performance in aircraft, satellites, and wind turbines encourages lightweight design more than ever, which eventually gives birth to more flexible engineering structures exhibiting large deformations in operational conditions. Accordingly, continuously distributed geometrical nonlinearity resulting from large deformations is currently an important design consideration. Being guided with this motivation, this paper investigates the performance of ...
Comparison of Various Spring Analogy Mesh Deformation Techniques in 2 D Airfoil Design Optimization Yang, Yosheph; Özgen, Serkan (null, 2015-06-29) During the last few decades, CFD (Computational Fluid Dynamics) has developed greatly and has become a more reliable tool for the conceptual phase of aircraft design. This tool is generally combined with an optimization algorithm. In the optimization phase, the need for regenerating the computational mesh might become cumbersome, especially when the number of design parameters is high. For this reason, several mesh generation and deformation techniques have been developed in the past decades. One of the mos...
DYNAMIC MODELING AND CONTROL OF AN ELECTROMECHANICAL CONTROL ACTUATION SYSTEM Yerlikaya, Umit; Balkan, Raif Tuna (2017-10-13) Electromechanical actuators are widely used in miscellaneous applications in engineering such as aircrafts, missiles, etc. due to their momentary overdrive capability, long-term storability, and low quiescent power/low maintenance characteristics. This work focuses on electromechanical control actuation systems (CAS) that are composed of a brushless direct current motor, ball screw, and lever mechanism. In this type of CAS, nonlinearity and asymmetry occur due to the lever mechanism itself, saturation limit...

Citation Formats

A. İ. Küçükbayram, “Analysis and verification of a pyroshock test system,” M.S. - Master of Science, Middle East Technical University, 2021.